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v3.10.0.1

Supplemental Cash Flow Information - Narrative (Details) $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2017 USD ($)
Supplemental Cash Flow Elements [Abstract] |
Notes receivable reduction | $ 7.1

X
- Definition Notes Receivable Reduction + References No definition available. + Details
Name: | pwr_NotesReceivableReduction
Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SupplementalCashFlowElementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration